... glass fiber with steel wire inside 2)Bending radius is same as outer diameter Silicone hot air duct for HVAC and ... 1.high temperature duct, as suction and blast hose, suitable for hot air , blower, exhausting gas, etc. 2.Heat resistant ... blast hose, especially suitable: -For transmission hot and cold air. -For printing machines, blowers and compressors. -For exhausting gas, engine construction, ...